NOTE: these are just some selected examples, that can be illustrated as a side-by-side difference.
IDA v5.5 includes are many other improvements and new features that are not mentioned on this page -
simply because there was nothing to compare them with. For more information, please refer to
IDA v5.5 feature list.

We made numerous tiny improvements to the analysis engine. The above example illustrates just one particular case:
function arguments that are passed by references are handled more properly.
While there are lots of similar examples, we will limit ourselves to this single snippet. Anyway, you get the idea...

This sample is very spectacular: we switch from inhuman names and hex addresses
to a highly readable code. The transition is possible because we handle
handle dynamic symbols in MIPS ELF files and improved the MIPS module in many ways.